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t e e h S S t e e h S 2 N O R B G M d o M 0 W APPARATUS FOR STOPPINGENGINES.

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G. W. BROWN. APPARATUS FOR STOPPING ENGINES.

llllllllllll l$\l XX N UNITED STATES PATENT OFFICE.

GILMAN IV. BROl/VN, OF WEST NE\VBURY, MASSACHUSETTS, ASSIGNOR, BY MESNEASSIGNMENTS, TO THE ELECTRO STEAM APPLIANCE COMPANY, OF NEIV JERSEY.

APPARATUS FOR STO PPI NG ENGIN ES.

SPECIFICATION forming part of Letters Patent No. 575,144, dated January12, 1897. Application filed October 4, 1895. Serial No. 564,582. (Nomodel.)

To all whom it may concern: alarm is to reduce to the minimum the lia-Be it known that I, GILMAN W. BROWN, of bility of unnecessary tamperingwith the ap- IVest Newbury, in the county of Essex and paratus,particularly by mischievously-dis- State of Massachusetts, have inventedcertain posed persons. new and useful Improvements in Apparatus To theseends the invention consists in the for Stopping Engines, of which thefollowing improvements which I will now proceed to is a specification.describe and claim.

This invention relates to apparatus of the Of the accompanying drawings,forming a character described in Letters Patent-of the part of thisspecification, Figure 1 represents 10 United States No. 544,085, grantedto me a side elevation of that portion of the appa- August 6, 1895, forimprovements in apparatus which includes my improved mechanratus forstopping engines, said apparatus inical or speed-controlledactuator-releasing eluding a casing adapted to form a part of the means.Fig. 2 represents an elevation of the steam-conduit which supplies theengine and construction shown in Fig. 1 from a different I 5 providedwith a steam-outlet and with a cylpoint of view. Fig. 3 represents anelevation inder having a vent, an outlet-closing valve from the sideopposite that shown in Fig. 2. within the casing adapted to be held inits Figs. 4 and 5 represent vertical sections of a closed position bythe steam-pressure, avalveportion of the apparatus. Fig. 6 representsoperating piston movable in said cylinderand a section on the line (3 6of Fig. 4. Fig. 7

20 connected with the outlet-valve, a vent-conrepresents a section online 7 7 of Fig. 6. Fig. trolling valve adapted to close said vent, a 8represents an elevation showing an engine vent valve operating device oractuator provided with my improvements. Fig. 9 rep adapted to be set foraction, and an actuatorresents a section on line 9 9 of Fig. 8. Fig.'arrestin g trigger or trip, the arrangement be- 10 represents a sectionsimilar to Fig. 9, show- 2 5 ing such that upon the release of saidactuaing the parts in a different position. Fig. 11 tor the vent will beopened, thus permitting represents aseotion on line 11 11, Fig. 8. Fig.the escape of steam from the cylinder at one 12 represents a top View ofthe shell or casing side of the valve-operating piston, so that thewhich contains the circuit-closing deviceheresteam-pressure in saidcasing will displace inafter referred to. Fig. 13 representsa sec- 30the piston and close the steam-conduit, thus tion on line 13 13, Fig.12. Fig. 14 represents shutting oif the steam from the engine and asection on line 14c 14, Fig. 12. Fig. 15 repat the same time opening thesteam-outlet to resents a section on line 15 15, Fig. 9.

the atmosphere. In said patent I show elec- The same letters ofreference indicate the trically-controlled means, adapted to be opsameparts in all the figures.

3 5 erated by an attendant, for releasing or un- In the drawings, (trepresents a casing looking the vent-valve actuator. which forms apartof the conduit a, supply- It is the object of my present inventionto ing steam to a steam-engine a a represents provide means forautomatically unlocking an outlet connecting said casing with the ex theactuator by speed-controlled mechanical ternal air, said outlet havingat its inner end 0 means under such an arrangement that when an annularvalve-seat a the speed of the engine is unduly increased b representsthe outlet-closing valve, which or exceeds a predetermined rate theactuator is formed to be seated upon the seat a and will be allowed toact. is adapted to be held upon said seat by the The invention also hasfor its object to prosteam-pressure in the casing under normal 45 videmeans for giving an alarm prior to the conditions. 5 release of theactuator by the electrically- 0 represents the valve-operating piston,

controlled trigger-operating means set forth which is connected by a rodor stem 61 within in said patent, the apparatus being equipped theoutlet-valve b and is located in a cylinwith both electrical andmechanical means der 60", which forms a part of the casing, said 50 forreleasing the actuator. The object of said cylinder opening at one end,which I term the mouth of the cylinder, into the casing, and having atits other end a vent a which is preferably a pipe extending from saidcylinder and provided with a valve d whereby it may be opened andclosed. The piston c fits the interior of the cylinder to somewhatloosely, so that steam can pass aroundit into the cylinder, as indicatedby the arrows in Fig. 9, steam being thus caused to balance the pistonso long as the vent a remains closed. So long as the piston is thusbalanced the shut -off valves hereinafter described are held open andthe outlet-valve b is closed, the latter being subjected tosteampressure upon one side only. 7

The piston c is of greater area than the outlet-valve, so that when thevent of the cylinder is opened, as hereinafter described, it releasesthe pressure from the cylinder and thereby unbalances the piston, thesteampressure exerted on the inner side of the piston displacing thelatter, forcing it into the cylinder, and removing the outlet-valve fromits seat, thus opening the outlet a as shown in Fig. 10, and permittinga discharge of the steam into the atmosphere. This operation relievesthe pressure in the casing and in the conduit between the casing and theengine sufliciently to prevent the pressure of the steam between thecasing and the engine from continuing the operation of the engine.

Between the steam-inlet end and the steamoutlet end of the casing areoffset partitions (1 which project from the inlet end of the casingacross the central portion thereof and are provided with two ports a athrough which steam passes from the inlet to the discharge side of thecasing, the valve-stem 01 passing through said ports, as shown in Fig.9. Between the valve 1) and piston c is located a shut-off valve e,alsoaliixed to the stem d. hen the outlet-valve is closed upon its seat a itis separated from the port a and the shut-off valve 6 is separated fromthe port (L both of said ports being unobstructed, so that the steampasses through them, as indicated in Fig. 9. When the piston isunbalanced and displaced, as shown in Fig. 10, the outlet-valve closesthe port a and the shut-off valve e closes the port (1, so that when theoutlet at is opened the passage of steam through the casing is at thesame time shut off.

The valve a which opens and closes the vent of the cylinder, is openedby an actuator, which is preferably a weight f, fitted to slide upon aVertical guide, such as the vent-pipe a said weight having an inclinedface f upon its lower portion formed to engage a lever g, which ispivoted at g to the valve-casing and bears upon the stem g of the valve.When the weightf is dropped from the elevated position shown in Fig. itmoves the lever g and causes the latter to open the valve. The weight fis provided with a flange f at its upper end, which is engaged by atrigger-or trip it, pivoted at h to a fixed standard t", which may besupported in any suitable way. Said trigger has an elongated arm 71?,which projects clownwardly and is provided at its lower end with a studh 7r represents a lever or detent pivoted at 7L5 to the casing t' andformed at its outer end to engage said stud 7L3 and thus lock thetrigger. An armature h is attached to the lever or detent h, saidarmature being arranged in suitable proximity to the poles of anelectromagnet h supported in the casing t' and included in an electriccircuit. Then the circuit is broken and the armature is released, thedetent IL4 is held in the position shown in Fig. 4 by gravitation and isengaged with the stud 71 on the trigger-arm, the trigger being thereforecaused to hold the weight fin its raised position. Vhen the circuit isclosed, the armature is attracted and raises the detent 71 causingit torelease the arm 72 and the trigger h. The weight f is thus released andallowed to drop and open the valve in the vent of the cylinder.

The construction thus far described is substantially the same as in myformer patent above mentioned.

My present improvements relate chiefly to the let-off mechanism wherebythe weight or actuator fmay be released and allowed to act, and theycomprise speed-controlled means operated by the engine for releasing theweight automatically when the speed of the engine rises above apredetermined point, thus preventing the engine from running away. Tothis end I provide a shaft m, which is journaled in suitable bearings inor contiguous to the casing t. To said shaft is affixed a projection m,which supports a weighted arm m the latter being pivoted at m to theprojection m. The weighted arm normally stands inclined inwardlyfrom'the pivot m toward the shaft, as shown in Fig. 4, and is supportedby an adjustable stopscrew m the weight of the arm holding it in saidposition under normal conditions. The shaft on is connected with amoving part of the engine, so that it is continuously rotated while theengine is in operation, the connecting means here shown being a pulley mon the shaft and a belt m running from said pulley to the main shaft mof the engine, Fig. 11.

The arm m is so weighted and arranged and the shaft m is so connectedwith the engine that when the engine is running at a normal or safe ratethe weighted arm will remain at rest on the stop m When, however, thespeed of the engine exceeds a predetermined limit, the arm m is thrownoutwardly by centrifugal force, as shown in Fig. 5 and by dotted linesin Fig. 4, and assumes a position which causes it to strike the detent hand raise the latter out of engagement with the trigger-arm 723, thelatter being thus released and the weight f allowed to act. It will beseen, therefore, that I have provided a speed-controlled let-off whichis adapted to automatically cause the operation of the enginestoppingapparatus without interfering with the electricallycontrolled means foraccomplishing the same result and is made operative by an increase inthe speed of the engine. I believe this to be broadly new, and Itherefore do not limit myself to the details of mechanism herein shownand described, and may variously modify the same without departing fromthe spirit of my invention.

The electromagnet 71 is included in a suitable electric circuit,comprising the circuitwires on w and a push-button or manuallyoperatedcircuit-closing device t, Figs. 12 and 13, adapted to be moved to closethe circuit and energize the magnet, thus causing the operation of theabove-described apparatus. In order to prevent the needless operation ofsaid apparatus by mischievously-disposed persons, I provide means forgiving an alarm prior to the closing of the circuit, so that theintention of any person to close the circuit will be made manifest. Tothis end I in close the circuit-closer if in a casing 10, having a coveru, which must be opened before ac cess can be had to the circuit-closer.In the casing are two separable terminalsn n, which, together with thewires 11 n constitute a branch of the main circuit, which includes theelectromagnet h and the wires w w. The branch circuit includes anelectric bell o operated by an electromagnet o of much higher resistancethan the electromagnet it. When the cover it is opened, the terminal -vcomes in contact with the terminal n and thus closes the circuit. Owingto the high resistance of the electric bell and the low resistance ofthe trigger-operating electromagnet h the bell will be operated, but thetrigger will not be released until the circuitcloser t is operated, thuscutting out the branch circuit and the bell, whereupon the magnet h willoperate to release the trigger. It will be seen, therefore, that no onecan operate the apparatus electrically without first giving an alarm.

I claim-- 1. In an apparatus of the chararcter specified, thecombination with a vent'controlling valve, of an actuator therefor, anarmature serving as a detent normally restraining said actuator, andspeed-controlled means actuated by the power of the engine to displacesaid detent by centrifugal force, substantially as and for the purposedescribed.

2. In an apparatus of the character specified, the combination with avent-controlling valve, of an actuator therefor, a detent normallyrestraining said actuator, and speedcontrolled means actuated by thepower of the engine to displace said detent bycentrifugal force,substantially as described.

3. An apparatus of the character specified, comprising avent-controlling valve, an actuator therefor, an actuator-arrestingtrigger or trip, a locking arm or detent normally standing in positionto lock the said trigger, and speed-controlled means actuated by thepower of the engine to displace said detent by centrifugal force andthereby release the trigger and actuator, substantially as described.

4. In an apparatus of the character specified, the combination with avent-controlling valve, of an actuator therefor, an electromagnet, acentrifugal speedcontrolled device, and a detent or trigger normallyrestraining the valve-actuator and located between the electromagnet andthe centrifugal speed-controlled device and adapted to be actuated byeither.

5. An apparatus of the character specified comprising a vent-controlling valve, an actuator therefor, an actuator-arresting trigger or trip, alocking arm or detent which normally stands in position to lock saidtrigger, a shaft contiguous to said detent adapted to be driven by theengine, and a weighted arm pivotally connected with said shaft andadapted to be moved centrifugally into position to release said trigger.

6. An apparatus of the character specified, comprising avent-controlling valve, an actuator therefor, an actuator-arrestingtrigger or trip, a locking arm or detent which normally stands inposition to lock said trigger, an electromagnet arranged to displacesaid detent when energized, a shaft contiguous to said detent adapted tobe driven by the engin e, and a weighted arm pivotally connected withsaid shaft and adapted to be moved centrifugally into position torelease said trigger.

7. In an apparatus of the character specified, the combination of avent-controllin g valve, an actuator therefor, electrically-operatedactuator-controlling means including an electric circuit and acircuit-closing device therein, a shield or casing adapted to norm allyprevent the operation of said circuitclosing device, a branch circuitwhich is broken by the cover of said shield when said cover is closedand is closed h automatically when said cover is opened, and an alarmincluded in said branch circuit and adapted to be made operative by theopening of the casing.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, this 19th day of September, A. D.1895.

' GILMAN W. BROWN. Witnesses:

O. F. BROWN,

A. D. HARRISON.

IIO

